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Executing a Program:
How does a program execute? Refer to the Slug Computer.
Program is in memory (machine language)
Computer executes one instruction at a time
Computer uses the IC (Instruction Counter) to remember which instruction to fetch.
Part of the instruction represents the code (what to do)
Another part represents the address (where data is)
Sample programs to try:
- Start with a value in position 90. Write a program to copy the contents of position 90 (A) to position 91 (B)
- Start with three values in positions 90,91,92. Write a program that adds these three values and writes the result in position 94.
- Start with three values in positions 90,91,92. Write a program that computes the average of these three values and writes the result in position 94.
- Start with two values in positions 90 (A) and 91 (B). Write a program that copies whatever value is higher to position 92 (C).